Method and apparatus for resurfacing worn or pitted surfaces



Oct. 16, 1928.

A. O. VAN DERVORT METHOD AND APPARATUS F0 R RESURFACING WORN OR FITTED SURFACES Fi ed Feb. 24, 1925 BY I QA/W H ATTORNEY Patented @et. 16, 1928.

UNITED STAT ADRIAN O. VAN DERVORT, OE TROY, NEW YORK.

METHOD AND APPARATUS FOR RESURFASING WGRN OR FITTED SURFACES.

Application filed February This invention relates to facing jigs, fixtures, apparatus or devices for facing or refacing electrical contact points or faces for timing-circuit-breakers for automobiles, though it is noted that the invention is not limited to circuit breakers nor in some respects even to electrical contacts.

G'ne object of the invention is to provide an apparatus or device of this kind which will ace or reface a pair of contact faces of a circuit breaker or other device in such a way that they make firm even contact when operatively assembled.

Another object of the invention is to pr0- vide an apparatus or device of this kind which will automatically -face or reface, at the proper plane, the contact face of a timer contact, merely by placing the arm in the-device and operating the device.

Another object of the invention is to pro vide an apparatus or device of this kind which is adjustable for different styles of contacts.

Other objects are to provide an eflicient abrading device of general application.

Still other objects of the invention are to improve generally the simplicity and cfli ciency of such devices and to provide a device or apparatus of this kind which is durable, economical to manufacture and operate and which will not get out of order.

Still other objects of the invention will appear as the description proceeds; and while herein details of the inventionare described,

the invention is not limited to these since many and various changes may be made without departingfrom the scope of the invention as claimed.

The inventive features for the accomplishment of these and other objects are shown herein in connection with an improved abrading or facing jig, fixture or device -which, briefly stated, includes guide means for bolding a movable abrading member with its surface perpendicular to the axes of a pair of plungers one of the plungers carrying means for holding a contact stud perpendicular to said surface'for refacing the contact face thereof; while the other ofthe plungers carries holding means for holding a timer'contact arm in position to have its contact face engaged by said surface." A gauge onsaid holding means holdssaid contact arm at the proper angle for refacing its contact face so that it will make good contact with'the refaceo contact stud.

Serial m. 11,377.

In the accompanying drawing, showing by way of example, one of many possible embodiments of the invention,

Fig. 1 is a front elevation of thefixture;

Fig. 2 is an end elevation of the fixture;

Fig. 3 is a fragn'iental front elevation, partly in section, showing the contact arm mounted in the holding means and engaged by the gauge; h

Fig. 4 1s a fragmental front elevation showing the stone and guide means;

Fig. 5 is a fragmental elevation showing a timing breaker and parts therein to be faced or refaced; and j Fig. 6 is a transverse vertical sectional view, partly in elevation, showing one of the plungers and means for limiting its movement.

The facing fixture or device may be used for many purposes and is not limited in its application to electrical devices. It is here shown and described as adapted for facing or refacing contact faces of contact points, or members, of a timer or breaker of an ignition or other system.

This breaker comprises a stationary contact including a bracket 10 having a threaded aperture receiving the threaded shank of a contact stud 11 having a contact face 13 and held in adjusted position by a jam nut 14. A contact arm 15 pivoted at its guiding or pivot end on the timer shell 16 is provided at its outer end'with a flat contact face 18 engageable with said contact face 13, and an intermediate insulating block or motive part 19 engageable by the rotor cam or actuating element 20 to cause said contact faces to separate for interrupting the low tension current. Said contact faces 13 and 18, in order to insure good electrical contact. when engaged together, must be faced to lie in a common plane preferably perpendicular to the axis of said. contact stud 11. This is efficiently accomplishedby my new fixture now to be de scribed. I

My improved fixture or device comprises a body 25 provided with a wide, fiat base 26, a pair of smooth vertical bores 27 and 28, the bore 27 being larger. than the other,and a pair of upright standards 29, in a vertical plane offset to the rear of said bores and provided with horizontal bores,.perpendicular to said offset plane, in which are carried a pair of journals, each having an outer head 31 2) an intermediate bearing portion 32, a shoulder-forming reduced inner end portion received in one of said horizontal bores and having a threaded projecting end 34 receiving a nut 35 for holding the journal firmly in place. Rollers 36 rotatable on said bearing portions are each provided with a flange 37 adjacent to the standard and form guide means adapted to support a corundum stone or other abrasive device 38 (Fig. 4t) having a true plane lower surface 39 reciprocatory on said rollers over said vertical bores, the abrader being guided by the flanges 37.

A small hollow plunger 40 (Fig. 1) in the smaller bore 28 and open at the lower end is provided at the upper end with a collet including a split taper l2 threaded at its lower part 13 receiving a milled locking nut 44. Said plunger is arovided with an axial bore for snugly receiving the shank of the contact stud 11 to hold it perpendicular to the'stone 38. A spring compressed in said plunger between its closed upper end and the closed bottom 16 yieldably presses the contact stud against the stone, so that when the stone is reciprocated on the rollers, the face is faced or refaced perpendicular to the surface 39.

A large hollow plunger or supporting member slidably disposed in the larger bore 27 is provided its upper end with a bracket arm 51 disposed rearwardly between said uprights 29 and provided at the outer or rear end with a pair of upwardly disposed lugs 52 provided with axially alined horizontal apertures receiving a positioning pin 54.- for pivotally receiving between said lugs the pivoted end of the timer contact arm 15 (Fig.

- 3) with the contact surface 18 to be faced adjacent'to the path of the lower face 39 of said stone. A bracket 55 fast on said bracket arm near the insulating block 19 is provided with a thickened upper portion 56 (Fig. 1) having a gauge carrying bore therein axially parallel with said alined apertures, and re ceiving a shank 57 carrying an eccentric gauge 60 disposed over and engageable by the insulating block 19 of said contact arm.

, I Said shank is adjustably rotatable and proects sufliciently to carry a lateral manipulating stem 61, whereby said gauge may berotated to give to the point of its surface engaged by the insulating block, under the action of .the flat spring 63 (Fig. 3). the exact position relative to the axis of the pin 54 that the most inward engagedpartbf the timer rotor cam 20, of the particular timer used, bears to the pivoted axis of the timer arm inthe timer, whereby the fixture may be adapted for use with different timers.

of a set screw 64; (Fig. engaging the shank 57 If the device is intended forwork only on one type of timer, it is not necessary that thegauge 60 be adjustable or eccentric.

V spring 65 compressed in said large plunger between the closed upper end 66 and The gauge is held in ad usted position by means the closed lower end of the bore 27 holds the contact face 18 of the timer arm in abrading contact with said stone 38 on the rollers, whereby the contact face 18 of the timer arm is surfaced to the same plane to which the contact face 13 of the stationarycontact is surfaced, and is thereby rendered perpendicular to the axis of the contact stud when in the timer and made to uniformly and accurately engage said face 13 throughout. The wire of the spring 65 has a cross-section less than one fourth the cross-section of the spring Y63; and the spring 65 is therefore weaken than, and does not interfere with, the func tion of the spring 63.:

Said plungers 4:0 and 50 are provided in their front faces with longitudinal slots 67 registerable with perforations 68 (Fig. 6) in the front of said body; and vertical leaf plates 69 detachably secured by screws 70 to the lower part of said body carry pins 71 secured to the back of said leaf plates and respectively passing through said perfora'- tions 68 into said slots 67, whereby upward against the ends of the stone and projecting below to form stops 79 for limiting endwise movement of the stone.

The operation is simple and obvious from the foregoing. lhe stud 11 is clamped in the collet as in Fig. 1, and the arm 15 is placed as in Fig. 3, the gauge 60- being adjusted so that the point thereof engaged by the block 19 occupies the same position relative to the pin 54 and the surface 38 that the block 19 in the timer occupies relative to the pivot of tne timer arm and the contact face 13 in the timer.

Then the operator places the stone over the rollers, the springs 15' and 65 pressing the aces 13 and 18 into engagement with the stone while the operator reciprocates it until the faces 13 and 18 are properly faced. Obviously, it is not necessary to face the faces 13 and 18 simultaneously, and if only one needs facing, the other need not be refaced.

I claim as my invention:

1. A device comprising means for. guiding 'engageable by a guiding element and an abutting face engageable by an actuating means, said device comprising a supporting member; mounting means for determining the position of the contact face carrying element on said supporting member,said mounting means including positioning means on said member engageable with the guiding part of the contact face carrying element for mounting said guiding part of the contact face carrying element and a gauge on said member against which the abutting face of the contact face carrying element maybe held when said guiding part is thus mounted; yieldable means for pressing the contact face carrying element against the gauge; guide means having a predetermined location relative to said gauge and said positioning means for determining the active path of a surfac ing means in proper relation to the location of said guiding part and abutting face, and in position to be engageable with said contact face when the contact face carrying element is thus mounted; and springable means for moving said supporting means toward the surfacing means with less force than said yieldable means.

3. A device comprising a body having a bore; means for guiding a movable abrading member with its lower face perpendicular to the bore; an upwardly spring pressed plunger in said bore provided with a bracket arm provided with spaced lugs having alined horizontal apertures; a pin in said aperture for receiving the pivotal end of a timer contact arm with the contact face thereof adjacent to said face; a spring stronger than the plunger spring carried by and on the bracket arm for yieldably raising the timer arm; and,

means other than the abrading surface for limiting movement of the arm by said spring to a position of the timer arm at the proper angle for facing it. 7

l. Adevice comprising a body having a bore; means for guiding a movable abrading member ith its lower face perpendicular to the bore; an upwardly spring pressed plung er in said bore provided with a bracket provided with spaced. lugs having alined hori zontal apertures; a pin in said aperture for receiving the pivotal end of a timer contact arm with the contact face thereof adjacent to said lower face; a spring stronger than the plunger spring for yieldably raising the timer arm; a bracket fast on said bracket arm; a gauge on said bracket engageable with the insulating block of the timer arm to engage the timerarm against the action of said spring at the proper angle for abrading.

5. A device comprising a body having a bore; means for guiding a movable abrading member with its active surface perpendi-cm lar to the bore; an upwardly spring pressed plunger in said bore provided with a bracket arm provided with spacedlugs having alined horiaontal apertures; a pin in said aperture for receiving the pivotal end of a timer contactarm with the contact face thereof adjacent to said active surface; yieldable means on the bracket arm stronger than the plunger spring for yieldably raising the timer arm; abracket fast on said bracket arm; and an adjustable gauge on said bracket engageable with the insulating lock of the timer arm to engage the timer arm against the action of the yieldable means at a differentangle for abrading depending upon the size of the rotor of the timing breaker.

6. A device comprising an upwardly spring pressed plunger provided with a bracket arm provided with lugs having apertures; means for holding a movable abrading member with its lower surface perpendicular to the plunger; a pin in said aperture for receiving the pivotal endof a timer contact arm with the contact face thereof adj acentto said lower surface; spring stronger than the plunger spring for yieldably raising the timer arm; a bracket fast on said bracket arm; an eccentric gauge disposed over and engageable by the insulating block of said contact arm and having a shankadjustably rotatably received in and projecting from said bracket and provided with a lateral manipulating stem whereoy said gauge may be rotated to give to the surface engaged by the insulating block under the action of said spring substantially the same position rela tive to the axis of said pin that the most inward engaged part "of the timer rotor of the particular timer used bears to the pivoted axis of the timer arm in such timer.

7. A device for facing contact faces of a contact stud and a timer arm of a timing breaker, said device comprising a body provided with a pair of vertical bores, and standards disposed in a vertical plane offset to the rear of said bores; horizontal rollers on said standards perpendicular to said plane and adapted to horizontally guide over said bores the lower face of an abrading member; an upwardly spring pressed plunger in one bore having a collet adapted to hold the contact stud perpendicular to said member; an upwardly spring pressed plunger in the other bore provided with a bracket provided with spaced lugs having alined horizontal apertures; a pin in said aperture for receiving the pivotal end of the timer contact arm with the contact face thereof adjacent to said lower face; a spring for yieldably raising the timer arm; bracket fast on said bracket arm; and a gauge on said brac rot engageable with the insulating block of the timer arm to hold the timer arm against the action of said spring at the proper angle for abrading. i

8. A device comprising means for guiding a movable abrading member with its abrad ing face in a constant plane; a movable member movable toward said face; pivot means for pivotally mounting the pivoted end of a timer contact arm on said movable member; a gauge mounted on said movable member and having its active surface engageable by an insulating block on the timer arm to determine the angle of the timer arm relative to said abrading face; the active face of said gauge approxiu'iately simulating in contour the path of the most eccentric part of the active face of the timer cam and bearing substantially the same relation to the pivot means and abrading face as said path bears to the pivot means and contact face of the timer.

9. A surfacing device for surfacing the contact face of a contact carrying element having a guiding part engageable by a guiding element and an abutting face engageable by an actuating means, said device comprisin a supporting member; mounting means for determining the position of the contact face carrying member on said supporting meml er, said mounting means including positioning means on said member engageable with the guiding part of the contact face carryingelement for mounting said guiding part on the member; and a cylindrical gauge approximately simulating the path of said actuating means on said member against which the abutting face of the contact face carrying element be held when the guiding part is thus mounted; and means holding said cont-act face carrying element with said ans for guida movable abrading memoer with its tCLlVG face in a constant plane; a movable member movable toward said face; means for pivotally mounting the pivotal end of a timer contact arm on said member with the contact face thereof adjacent to said active face; a cylindrical gauge mounted on saidbracket arm and eccentrically rotatably adjustable on an axis parallel to the pivotal axis of the timer contact arm and having its cylindrical surface approximately simulating the path of the timer contact arm actuating means and engageable with an insulating block on the timer arm to determine the position of the timer arm at the proper angle for abrading; and means for pressing said arm toward said gauge.

11. A device comprising an abrading stone; a strip of spring metal intermediately bent to form a handle, and formed withlateral portions lying on the stone and downturned ends clamping against the ends of the stone and projecting below the ends to form stops.

Signed at city of Troy in the county of Rensselaer and State of New York this 18th day of February, A. D. 1925.

ADRIAN O. VAN DERVORT. 

